Patent
1975-06-10
1977-02-01
Moose, Harry
317136, 3171555, H01H 4700
Patent
active
040063860
ABSTRACT:
A monitor and safety device for a direct current voltage coil shifting circuit conventionally used with a shifting mechanism having two coils, one to control rotation of a drive shaft in one direction and the other to control rotation of the drive shaft in the other direction. The device monitors the current through the shifting mechanism coils and is effective, when the shaft is running in one direction above a predetermined rpm level to electronically disengage the other shifting coil circuit so that, as long as the shaft turns in that direction above the predetermined rpm level, it cannot accidentally be shifted; and, also, so that, if the coil controlling the shaft rotation in the direction it is turning is accidentally disengaged, it cannot be re-engaged until the rpm's have been reduced to or below the predetermined rpm level. The device includes an rpm detector to sense the rpm's of the shaft and to provide a corresponding voltage which is an electronic replica of the rpm's of the shaft and which is used to trigger a speed interlock circuit when the rpm's are above the predetermined level.
REFERENCES:
patent: 2990506 (1961-06-01), Montross
patent: 3704382 (1972-11-01), Huntzinger
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